Portable power system



FIG. 1 is a top, perspective view of a portable power system, showing my new design.

FIG. 2 is a right side view of the portable power system, of FIG. 1.

FIG. 3 is a front view of the portable power system, of FIG. 1; and,

FIG. 4 is a left side view of the portable power system, of FIG. 1. 

The ornamental design for a portable power system, as shown and described. 